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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69e54eba22ec707d44beeae970f84b3af7be568052e462b9966ba556286e7ff7' 
  AND token = '/jqqSV2Xi87sFdv/NbVuMQimVly/xYn6AGpCb0A2kDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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