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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61deb9885041db5227ee14021b04661f907184f338b08f5e689d1ee88e8893f3' 
  AND token = 'IgKu4+bJ1WUtOx1Fb8/5S8elnBCff14UUA2QNdTxXFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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