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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cb1aaccb6aaff621714dd91028103007053b5d5d48e1100268c61888f242eb' 
  AND token = 'bbvGhSJ1NZ6M2jkPM8MqbjeKoU2thyw3wDnn8h3NR+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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