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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab1413a900b0dd3bebe2ffab7958d173bdab09aa0979e5ec8c40870016e6733' 
  AND token = 'AItAdNezvNBIUmOnoAKJiCxpoCcfJfJCkhnU7Y0SL3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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