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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fc14963e48298f530087c9037b1c765542369799a3c229e5972c3f37654228' 
  AND token = '6Ko9Y7AoYOO/onYYbO1AjBLqL+QSXddXk7ihFptk56I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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