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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c48d5c4f208852e417c91ab3381b9c84a2514757028744312532f9d052c9423f' 
  AND token = '5awrASTTfMAL9cWv9XQpMGjbjBF7RjaQOvWWInmphxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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