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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabaa5e99e551c33ab4532961f3c1fa71be49e1d2ebdda470b0a68e4325ef9d3' 
  AND token = 'ME7fTH6ue7mc92POnOMtTZY7MUUkvVRxIbdMdpaugEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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