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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec677b3ba9ac277493a4b9db2a9a104f6da279607837e32cb2ffade8e88d6b0f' 
  AND token = 'Ou/pbCsI6PlYiTKdiGKWGNpCP/KvbNl2gS/LXI3K9mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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