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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc2cb5af470bd3dd54c339ea742f8ac262d6713928329182d9cc286473d98c6' 
  AND token = '1CtsbZNX18FWW1XQwy+39WGc3jaVRgAP1E6sivlqnX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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