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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9ebd41815d37bbb0593d6552035c754502824e7f7e30421c9e1d1a7e4db90a' 
  AND token = 'fAZ0tH/zIf4hRIS9vgGoNQrnk2ml6P7as2kdYO6Jap4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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