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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e525b56cba85b0f5e574e95dcf5634d309c1913a0c72b5970e0b9e475550ae' 
  AND token = '9VWFnXHnx+nlt2kCay+voof0zDaU7Rbg1OXErJCwrK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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