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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146e6e1a29076c860cbfb06769c5ae6b6b2f59ac34ccf6e60f586657d367b18e' 
  AND token = 'ew+jTLV9hiBcizEgpjRo6LxA87eD8CfIPH7J569/kr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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