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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87db9f8af7c27b4430bfc45d930e0cf60ac86c38bfe625972543cd5cc9507f3d' 
  AND token = 'A5PQ5KHM8UD7JwqhhdTwm+Y4z3p3hi6R2PgWMQw0cbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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