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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7f52e22991a5c1048b0cf66371f55d9811da01b7d45ba6555b194fc03943a8' 
  AND token = 'r7q2Q6huU0B4fmBCLqXBqv1fQzgdg1AWHvms3BcLhws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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