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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32426b30290c3990a7ba933054637240f78cf0feb50fe2c4e9c687344b1f7201' 
  AND token = 'ZlrtgsCGdDXHJrjq/h0bvXQubwET33OzoDDyPT/3FsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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