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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad083715910d75af9e7a5bb26b97ed1ad4ed88b3759c4a043a135590df334563' 
  AND token = 'Y5pBipUeNeRIlVp7WHwelV9eoRBaMVVql6cQ0D4hK9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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