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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2272acd99dd7abe1245e8fb15bcf2694eb1c2651db7e3c826491cea7f87bfe6d' 
  AND token = '/2w1qUOyh9Y5Sy+Uh8oIZnpSpsKcNV8aD7GXdurytRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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