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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1dbfa6f092bd39aa590e6de768fc8695e7345f543c2ebfd4a373a174d83ef0' 
  AND token = 'kKuk3S/N3I6n7E0S6uJieK8FYR8QwkfswDlXO0OYZcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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