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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93013838493f50f3c8a2cc1b5f98c33e10581ef288b8187ac646d82f6f439f0b' 
  AND token = 'PSFndNKbq+vOjLXDzyDvED0om3XilfNkydUz8u53RAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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