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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7228e15710694ebb404b3c6f454c868143f4a590d4fccd2987381d5024bf802c' 
  AND token = 'iG0N0LxoqFU0IgyKFlWlfr7ekHqk9eK/0q80L/xGliQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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