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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28535eaf8bb6f1b7a4fa61ef865d6f3aecabb451ca1457c5ce4c4fdd65f472a5' 
  AND token = 'JmN8LfpLfhjrsha1Z/AtnFCl2HbgTbPoy4Q/dUXNEp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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