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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cc730b5f27834b39bba5522cc45ec5ef2aba2b8e9fa5f8ba6fb430f1ab2263' 
  AND token = 'cVCscGpn9kyV566QW3b0Yre22JkcjI9WoKGHDl7pIBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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