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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c8c30f4df11267c861608908d1167771b912a480ac2da69438ecb1053cfafe' 
  AND token = 'qjPy9uakmURG2Bku0fZlZZFJhZU/fuDNn1eurK1tHG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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