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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2825c08beff07882a4dcedd785fa7524e318804dc1f209484a7bbc31bea75ead' 
  AND token = 'Xri+tqPJW+nMWzt4hEh1Ixt5HWvn8y1Qh3U4yYeF0bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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