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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0cf252d9886f70d0bfce206bf60e39ac8847d16ca78887017f95ca7b2ebb85' 
  AND token = 'oeja3ltt12+JXEVK8aluCDt+EDjBWZAdFwM0NjtAzy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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