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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d21550e975a9dc0c9b0bf47b741fdff79e9de56c136136b1e4b04f39e912df7' 
  AND token = '/FoS+MxeY4ZC5d+2yDNqWpZmLOnMiT2HVUFYjIXKb1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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