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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38eb1f4562643ecdb0da0b9adbddb4834427e3dff4d16f7ed363bbbc4386ea8c' 
  AND token = 'IY2OKukk0/CHB2JpiDurgD7EREkK265TClX7zNbluL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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