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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf1b8f93b157d374149343490910390a7e0c949b357e6809c1122bc3c9026dc' 
  AND token = 'Btk934ineeNgYuC2NU8axkaVpq67/TUzxCOsABcocm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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