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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a395673688720db2b8bbe7aa8fdb44b96590595ee07a955178f7c994c9f30e42' 
  AND token = 'L6B2YQQl7eIrInNU7lEone/6pGwKIkgK3IVI5EB1m2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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