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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097f7f9be73f292dfae983c5deeb24b583be0d6a418b9cbe0ae909c8851f1e70' 
  AND token = 'X+cJwnjYH1PIizFeAVrtD0g1kFRZdM3rL8h41Uid5GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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