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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55eb839d0c61f3b56ef1235dbbf047208a226aad991d653613fa15d97ab74041' 
  AND token = 'lO70bmkoIFV3sahegjnmo1cP8BR1cUWRpD+I4uT6z+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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