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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f4e1e25ff746036d1ac59ebee8ae8213f5fb94b6cd5c539e9fefb008385755' 
  AND token = 'PUSepykuKYnKpQLJTaJU+Y2nLIr8IbbbWVwgoeP3Llc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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