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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ed9242ce8fb5d8339168af221064298251ff8ff9de57892918d448cd9031e1b' 
  AND token = '3ITpLYo1OvsPv2ibi03Kc/Q5BLFb7+iGeF0q8le0tl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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