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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b17d8b3a59447f6b9e494e08957314b8ecd0f02ad5e95ad149033fa5d365ca' 
  AND token = 'MUurvK8PWJ3eiOejAIukYky49RbdkamQ1t3ij2wjFsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}