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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd715898fd65f28227db20918ddedc5a5ce3ce3c5dd62be73df0a65d2b35898f' 
  AND token = '0NS/iNh/utZXMzBUvSh2H3uI+qTV2KaD3uQl34VVy7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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