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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcd087ff9824e4947adf0c34cfcde3f08b6c931413ab5cee87b92bb8e6b2008' 
  AND token = '11oCcv3NjoRKJ78GUeELmftzI3aYO8+nQ322Trn+f+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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