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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07108b1ee92f066b5af7931eb953eb9173c789db650795d4da951c6d26ba2c35' 
  AND token = '8iY4INtp3dJghpZTndxU0JJn7C2k3KCqFifVTBxR0c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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