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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2f73d1ff62de9bbe7b36fd32e08b7199b2ca9ec1d6c1b8c5c628d77ed696a0' 
  AND token = '8hCp/QJkqI1w7mFUiq6EVd6BUVucsV51H0m5H+HViWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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