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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ed71c530737b0d4a1427889bd91f4de28d099b18f2405b99fedaa3dd46752e' 
  AND token = 'zmRl4oq6WquxhGUhzqu3OIk4SPJlCnXEbMyptOg3QsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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