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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8be30f73d500cc59df23d0e5c4ed64e2bfb8b9704c1e2ee44ac76089f6f2cfec' 
  AND token = 'E71rdi+ax7XlucaSyrzjqxOhIz6PkAUr6KltR43a5ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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