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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6853aa8aef8a1713d182a8bbb1a3930f5c14733ecdb4b0583200c8623b4e0b05' 
  AND token = 'Gt51+SOPq2rZ98kuOTEqjEdNJHgE7s7TxH3XOFqVy3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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