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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d520d2c71b88d7518b0b3c13e4ee11f90e4a1e1ca715860539176fbbaad3208' 
  AND token = '/dFu7ObzWQLkDMu5fw/NEtSVO05oJ4DVmYtQgRKotMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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