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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcfc9f02725af2df33b37c4f73f87c9696680f1e29769bd9b2365713def4db30' 
  AND token = 'W9glW5dkWA9E1oqw4lvQ7MrfA1Gom5+BKOqbMDaK1aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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