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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac59c7dccb575f12971985a109486012b31a41799c15e630b633c5ba0700d948' 
  AND token = 'uJL85RM4H/dUIAVkeIBv8KQUiXJw3/aVJKz1I1ZSK60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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