SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5409c833a5471d8694027c8ffb5d4f803e00f464b722aec4c842474863c6631a' 
  AND token = 'Q5z2OEfj5n1VM/BPALkiJwllEBFzZjlYDxPQ5gbXTl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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