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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3e37508aa2cd32d25eef01a2f5a0414e60babeb8d2284fb8ff6ae90a60f9b0' 
  AND token = 'BtgCk8dFzs+eabycFlpbzF9Bv65avKS0SIzeJX1VHn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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