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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80c0df66d6a43ff76d9fde0c285c2b1672213765f3ded7895e2e29411cab74f' 
  AND token = 'RY8Szmu2mOU4mgBd5231x8RikCBD7614PhtITW3Otsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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