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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e29ac20d7c8e120e150a21ece04dee583ab15af14df8ffa9faf38659f95819c' 
  AND token = 'LPPiT8R2p1vlgEEymjRGy/ledMtHJ+sWZjkiLsxAyuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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