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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f37b861da5b4c5cfebdaa78056e145396bac41f790595d7a9a1476d9c1daa93' 
  AND token = 'jn1fSdSvYOwK12cSXJMSFqBVU8DY7OJ8aoguwuVtmKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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