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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57ede89a86418bd42ba2cfdf1edf3ed4613d417f1f371336451bab4cdf1ac95' 
  AND token = '/TVqUJFUDcQlIW7r3kvV95ANe8Uwn/7U2TzIvXBkL1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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