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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b90f205378d6afbbd33390b9af18d64119af6cf5021f2f95412569f75f79307e' 
  AND token = 'InIdAjKV4/2Uocc9xu6bsQQfyqmvqd2djj+rUVZevec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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