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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a78b49dd66390a8e8dc3aef8dcbcdafffe0104cfd5e813ef3f351149603735' 
  AND token = 'dGaLvNRyVK5CkimfuypVMUcWkz6qD06lR9GoOq20Zzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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