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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee2b6b1bd3587948af9eda666ae43ee6a4b3b4027b3d31c4a9c1485c3612597' 
  AND token = 'nM6cgz+W7GOGI11g+fjcVz70FWRUPTktTgLW//D8sHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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