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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04cc6e8e557693711043fa5f166ffceff876c9bc63aa712c5a72e9b5859ae17d' 
  AND token = '/zNnXerJYXrYbxbgZdFpToXRgwe3ljcfQCL6ys2lPZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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