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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20e7b40be575b73b3d3434f0326fb4902690fa8c6de5d54b4a08683a4bef404' 
  AND token = 't5acGg9Z27xckTSINJjalXuNHLjIFBKWTVJpw1JkjRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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