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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52521be6f0f86f926d99e0eedea7ed85c2a98a9becfa7d20b1cdc633d8bc6f8d' 
  AND token = 'C+0Bh6kBYNbDc79tRpXdaXTPHfRHgQNhhM4p70DzFko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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