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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e2d92ce966b8e801b12b1f485cc579af23aa4ad0a576a3d1e150ee8cb3331f3' 
  AND token = '2u0gXe2Lxb7jBdKA2I8pQti6QRr3+VsNHB8XucBQ8ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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