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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6acf59771d5a939e8b5399a93e06e1808e940cfbe1c6be0fbdb00e4b7a3496d' 
  AND token = 'hpnVuSsrXyjlmNeR9P1TvtDC4ONzFAKxN+1wx3dKS2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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