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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2125206c532c82a699b953264f83f9245ffedbcdd0738673fc94bdc270309e6' 
  AND token = 'irBv9gCZ98dQ9olOHcYJRckQnsXYP0SFT/hxr/A7VLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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