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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1591592b78361af748ed42b29a7c31b6eb8e26e2c265a4982e486993fc8e3872' 
  AND token = 'WwufKyG8cWnVBeJF8hhVE55fpQcDroRMz3aX4n186Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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