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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e65c787f8aa09e512915bf5ec27abe51239e13abdc6c29c7b10dc1f10db96c8' 
  AND token = 'QoRH/6rvOzH907f4fCKdyKx34OkS3BgI2FLTSEem2zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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