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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed68333f358bf1498c3bff68c9cb4bbafa9c407b64e8bdff61939090f60dd83' 
  AND token = 'uG0DJJ3s6L2mBZCqbmEf0rRO9oKJlX2vew32FkP8FOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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