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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2488693915736365dbef350cadb2c4e4f2895f58bfc95a1e5ef7938fdf55571' 
  AND token = 'mCvrnYHO1L+o+AqMbe8Cjqfb+SuySQQ2rIT1rk11MS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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